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参数资料
| 型号： | IRDC3839 |
| 厂商： | International Rectifier |
| 文件页数： | 12/35页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL REG 6A SUPIRBUCK DC/DC |
| 标准包装： | 1 |
| 系列： | SupIRBuck™ |
| 主要目的： | DC/DC，LDO 步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 6A |
| 输入电压： | 12V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 600kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | IR3839 |
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IR3839MPbF
Circuit Description
THEORY OF OPERATION
Introduction
The IR3839 uses a PWM voltage mode control
scheme with external compensation to provide
good noise immunity and maximum flexibility in
selecting inductor values and capacitor types.
The switching frequency is programmable from
250kHz to 1.5MHz and provides the capability of
optimizing the design in terms of size and
performance.
IR3839 provides precisely regulated output
voltage programmed via two external resistors
from 0.6V to 0.9*Vin.
The IR3839 operates with an internal bias supply
voltage of 5.2V (LDO) which is connected to the
Vcc/LDO_out pin. This allows operation with
single supply. The IC can also be operated with
Enable
The Enable features another level of flexibility for
start up. The Enable has precise threshold which
is internally monitored by Under-Voltage Lockout
(UVLO) circuit. Therefore, the IR3839 will turn on
only when the voltage at the Enable pin exceeds
this threshold, typically, 1.2V.
If the input to the Enable pin is derived from the
bus voltage by a suitably programmed resistive
divider, it can be ensured that the IR3839 does
not turn on until the bus voltage reaches the
desired level (Fig. 3). Only after the bus voltage
reaches or exceeds this level will the voltage at
Enable pin exceed its threshold, thus enabling
the IR3839. Therefore, in addition to being a logic
input pin to enable the IR3839, the Enable
feature, with its precise threshold, also allows the
user to implement an Under-Voltage Lockout for
the bus voltage (PVin). This is desirable
particularly for high output voltage applications,
where we might want the IR3839 to be disabled
at least until PVin exceeds the desired output
an external supply from 4.5V to 6.5V, allowing an
extended operating input voltage (PVin) range
from 1.5V to 16V. For using the internal supply,
voltage level.
10. 2 V
Pvin (12V)
the Vin pin should be connected to PVin pin. If an
external supply is used, it should be connected to
Vcc/LDO_out pin and the Vin pin should be left
floating.
Vcc (5.2V)
The device utilizes the on-resistance of the low
side MOSFET (sync FET) as current sense
element. This method enhances the converter’s
efficiency and reduces cost by eliminating the
need for external current sense resistor .
Enable Threshold= 1.2V
Enable
SS
IR3839 includes two low R ds(on) MOSFETs using
IR’s HEXFET technology. These are specifically
designed for high efficiency applications.
Under-Voltage Lockout and POR
The under-voltage lockout circuit monitors the
voltage of Vcc/Ldo pin and the Enable input. It
assures that the MOSFET driver outputs remain
in the off state whenever either of these two
signals drop below the set thresholds. Normal
operation resumes once Vcc/LDO and Enable
rise above their thresholds.
The POR (Power On Ready) signal is generated
when all these signals reach the valid logic level
(see system block diagram). When the POR is
asserted the soft start sequence starts (see soft
start section).
Rev 1.41
Fig. 3. Normal Start up, device turns on
when the bus voltage reaches 10.2V
Figure 4a. shows the recommended start-up
sequence for the normal (non-tracking, non-
sequencing) operation of IR3839, when Enable is
used as a logic input. In this operating mode Vref
is left floating. Figure 4b. shows the
recommended startup sequence for sequenced
operation of IR3839 with Enable used as logic
input. For this mode of operation, Vref is left
floating. Figure 4c shows the recommended
startup sequence for tracking operation of
IR3839 with Enable used as logic input. For this
mode of operation, Vref is connected to a voltage
greater than 1.5V.
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IRDC3840 | 功能描述:电源管理IC开发工具 IR3840 SYNC CONV 600kHz EVAL BRD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3840A | 制造商:IRF 制造商全称:International Rectifier 功能描述:USER GUIDE FOR IR3840A EVALUATION BOARD |
| IRDC3840W | 功能描述:电源管理IC开发工具 User Guide IR3840W Eval Brd RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3841 | 功能描述:电源管理IC开发工具 IR3841 SYNC CONV 600kHz EVAL BRD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3841W | 功能描述:电源管理IC开发工具 User Guide IR3841W Eval Brd RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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